ValveTestApps are not relevant but you can test them eitherway.

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Games that you can download using the Undead333 Patch:

7 Wonders: 2.
7 Wonders: The Treasures of seven.
AI War: Fleet Command.
Altitude.
Amazing Adventures: Around the World.
Amazing Adventures: The Lost Tomb.
America's Army 3.
AstroPop Deluxe.
Audiosurf.
BattleForge.
Bejeweled 2 Deluxe.
Bejeweled Deluxe.
Bejeweled Twist.
Big Money! Deluxe.
BookWorm Adventures Deluxe.
BookWorm Adventures Volume 2
BookWorm Deluxe.
Braid.
Chainz 2: Relinked.
Champions Online (maybe there is a way around the steam verification with the account).
Chuzzle Deluxe.
Cogs.
Counter-Strike (1.6 version).
Counter:Condiction Zero.
D.I.P.R.I.P. Warm Up.
Dark Messiah Might and Magic Single Player.
Darkest Hour: Europe '44-'45.
Day of Defeat.
Day of Defeat: Source.
Deathmatch Classic.
Defcon.
Discovery! A Seek & Find Adventure.
Dragon Age: Origins Character Creator.
Dynomite! Deluxe.
Dystopia.
Eets.
Elf Bowling: Hawaiian Vacation.
Empires 2.25.
Escape Rosecliff Island.
Eternal Silence.
EVE Online: Dominion (maybe there is a way around the steam verification with the account).
Everyday Genius: SquareLogic.
Feeding Frenzy 2: Shipwreck Showdown Deluxe.
Gemsweeper.
Global Agenda (maybe there is a way around the steam verification with the account).
The Graveyard Trial.
Half-life.
Half-life 2.
Half-life 2: Deathmatch.
Half-life 2: Episode One.
Half-life 2: Episode Two.
Half-life 2: Riot Act.
Half-life: Opposing Force.
Hammer Heads Deluxe.
Heavy Weapon Deluxe.
Iggle Pop! Deluxe.
Insaniquarium! Deluxe.
Insurgency.
Killing Floor.
killing Floor Mod: Defence Alliance 2.
Left 4 Dead.
Left 4 Dead 2.
Little Farm.
Lumines.
Luxor.
Luxor: 2.
Luxor: 3.
Luxor: Mahjong.
Luxor: Amun Rising.
Luxor: Quest for the Afterlife.
Madballs in...Babo: Invasion Dev.
Magnetis.
Mare Nostrum.
Mass Effect 2.
The Maw.
Money Tree.
Mr. Robot.
Multiwinia.
Mystery P.I.: Lost in Los Angeles.
Mystery P.I.: The Lottery Ticket.
Mystery P.I.: The New York Fortune.
Mystery P.I.: The Vegas Heist.
Ninga Reflex: Steamworks Edition.
The Office.
On the Rain-Slick Precipice of Darkness, Episode One.
On the Rain-Slick Precipice of Darkness, Episode Two.
Peggle Deluxe.
Peggle Nights.
Penguins' Journey.
Piratess, Vikings, & Knights 2.
Pizza Frenzy.
Planet Busters.
Plants vs. Zombies.
Poker Superstars 2.
Portal.
Quarrel.
R.U.S.E. Beta.
Rag Doll Kung Fu.
Reaxxion.
Red Orchestra: Ostfront 41-45.
Ricochet.
Ricochet: Lost Worlds.
RoboBlitz.
Rocket Mania! Deluxe.
Sam & Max 104: Abe Lincoln Must Die!
Samantha Swift and the Golden Touch.
Samantha Swift and the Hidden of Athena.
Serious Sam HD: The First Encounter.
Shattered Horizon.
Simplz Zoo.
Smashball.
Star Trek: D-A-C.
Starscape.
Synergy.
Talismania Deluxe.
Team Fortress Classic.
Texas Cheat'Em.
Torchlight.
Typer Shark! Deluxe.
Venice.
Wik and the Fable of Souls.
The Wizard's Pen.
Zen of Sudoku.
Zero Gear.
Zombie Bowl-O-Rama.
Zombie Driver.
Zombie Panic Source.
Zuma Deluxe.
Zuma's Revenge.
Zuma's Revenge! - Adventure.